Study of Hexane Adsorption on Activated Carbons with Differences in Their Surface Chemistry
Abstract
:1. Introduction
2. Results and Discussion
2.1. Relationship between the Physicochemical Characteristics of Activated Carbons and Gas Phase Adsorption Isotherms of Hexane
2.2. Relationship between the Physicochemical Characteristics of Activated Carbons and the Enthalpy of Immersion
2.3. Relationship between the Energetic Characterization (Characteristic Energy and Enthalpy of Immersion) and Physicochemical Characteristics of Activated Carbons
3. Materials and Methods
3.1. Activated Carbon
3.2. Nitrogen Adsorption Isotherms
3.3. Boehm Titrations
3.4. Hexane Adsorption Isotherms
3.5. Enthalpy of Immersion of Activated Carbon in Solvents
4. Conclusions
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Sample Availability: Samples are available from the authors. |
Activated Carbon | BET Surface Area (m2g−1) | Vo(N2) (cm3g−1) | Average Pore Size (N2-QSDFT) (nm) | Oxygenated Group Content (µmolg−1) |
---|---|---|---|---|
CAG | 840 | 0.34 | 0.785 | 0.33 |
CAON | 816 | 0.32 | 0.753 | 0.54 |
CAON723 | 903 | 0.35 | 0.785 | 0.43 |
CAON1023 | 935 | 0.35 | 0.785 | 0.34 |
CAG1173 | 996 | 0.36 | 0.785 | 0.30 |
Activated Carbon | Langmuir | Freundlich | ||||
---|---|---|---|---|---|---|
b (mbar−1) | nm (mmolg−1) | R2 | Kf (mmolg−1mbar−1) | 1/n | R2 | |
CAG | 0.087 | 0.052 | 0.986 | 0.053 | 0.309 | 0.974 |
CAON | 0.010 | 0.046 | 0.972 | 0.052 | 0.194 | 0.843 |
CAON723 | 0.463 | 0.090 | 0.948 | 0.064 | 0.503 | 0.973 |
CAON1023 | 0.261 | 0.193 | 0.989 | 0.171 | 0.520 | 0.959 |
CAG1173 | 0.627 | 0.269 | 0.983 | 0.172 | 0.589 | 0.984 |
Activated Carbon | −∆Him(C6H14) (Jg−1) | −∆Him(H2O) (Jg−1) | Hydrophobic Factor |
---|---|---|---|
CAG | 40.9 | 49.6 | 0.07 |
CAON | 16.4 | 66.6 | 0.07 |
CAON723 | 57.6 | 53.3 | 0.09 |
CAON1023 | 53.4 | 37.4 | 0.10 |
CAG1173 | 66.1 | 32.4 | 0.11 |
Activated Carbon | Area Accessible to Hexane (m2g−1) | Eo(C6H14) (Jmol-1) | Vo(C6H14) (cm3g−1) |
---|---|---|---|
CAG | 379 | 6881 | 0.07 |
CAON | 152 | 6922 | 0.07 |
CAON723 | 533 | 6149 | 0.09 |
CAON1023 | 494 | 5792 | 0.10 |
CAG1173 | 612 | 5656 | 0.11 |
Activated Carbon | Treatment |
---|---|
CAG | Starting carbon |
CAON | CAG exposed to oxidation with a solution of HNO3 |
CAON723 | CAON exposed to heat treatment at 723 K for 2 h under N2 atmosphere |
CAON1023 | CAON exposed to heat treatment at 1023 K for 2 h under N2 atmosphere |
CAG1173 | CAG exposed to heat treatment at 1173 K for 2 h under N2 atmosphere |
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Hernández-Monje, D.; Giraldo, L.; Moreno-Piraján, J.C. Study of Hexane Adsorption on Activated Carbons with Differences in Their Surface Chemistry. Molecules 2018, 23, 476. https://doi.org/10.3390/molecules23020476
Hernández-Monje D, Giraldo L, Moreno-Piraján JC. Study of Hexane Adsorption on Activated Carbons with Differences in Their Surface Chemistry. Molecules. 2018; 23(2):476. https://doi.org/10.3390/molecules23020476
Chicago/Turabian StyleHernández-Monje, Diana, Liliana Giraldo, and Juan Carlos Moreno-Piraján. 2018. "Study of Hexane Adsorption on Activated Carbons with Differences in Their Surface Chemistry" Molecules 23, no. 2: 476. https://doi.org/10.3390/molecules23020476